Carb install on 66, 327, 300HP

[Bill Richards]

I am trying to return my recently purchased 1966 Vette to stock condition. I want to install a Holly 3367 carb. The parts catalogs show two carburator to intake manifold gaskets being used, a stainless steel baffle gasket and the paper gasket. The question is, are both of these gaskets used and if so, in what order? Thanks for any advice.

Willie

[Peter L.]

Re: Carb install on 66, 327, 300HP

Willie - Both the gasket and baffle are used. Gasket is first (against the intake manifold) and then the baffle (directly under the carb). Pete

[Gerard F.]

Re: Carb install on 66, 327, 300HP

Willie,

The stainless steel baffle goes on top of the intake gasket and against the carburetor base. Try to get one of those heavy braided gaskets instead of the paper type. The 66 300HP intake manifold (mine's a 67 300),I think has a heat slot in the intake manifold and you will need a gasket with a dogbone cutout for the heat slot in it. Here's one source for the gaskets:

http://www.docrebuild.com/dr-r-web/CARB-GASKET.HTML

The heat slots only purpose is for fast warm up of the carb in cold weather, and also serves to cook the carb when the engine is hot. I took the advice off this forum to plug the holes in the heat slot with 7/16" freeze plugs before I installed my 3810.

I found that when you first put the carb on, it takes some overheating at first until the gasket seals off the vacuum leaks between the intake manifold and the carb. I went crazy for the first hundred miles and then the problem just went away with some tightening of the carb mounting studs.

Hope this helps,

Jerry Fuccillo
#42179

[Bill Richards]

Re: Carb install on 66, 327, 300HP

Thanks for the advice guys. I could not find this info in any of my manuals. Jerry, you are correct about the slot in the manifold. If I`m not mistaken, the heat riser, when closed. forces hot exhaust back through the manifold, under the carb., and out the other side. Thus, heating the carb. when cold, and boiling it when hot, if the riser is`nt working properly.
Where exactly did you employ the freeze plugs?
Thanks,
Willie

[Gerard F.]

Re: Carb install on 66, 327, 300HP

Bill,

Take a look at this post:

https://www.ncrs.org/forum/archive22.cgi?review=180798

And you can thank John Hinckley for this tip.

I used 7/16" brass freeze plugs (NAPA) and jambed them in the two holes at the ends of the heat slot with a 7/16" bolt. You might try 1/2" freeze plugs first,
mine went in a little too easy, and I found that one is leaking a bit.

Jerry Fuccillo

[Bill Richards]

Re: Carb install on 66, 327, 300HP Thanks for the

Gerald, thanks for the link, the info was right on target.
I found that a 7/16" fine tap made perfect threads. A little grease and a magnet solved the chip problem. A couple of sawn off bolts, with hacksawn slots, and permanent thread sealant, did the plugs.
I probably don`t need the SS gasket now?
Willie

[Gerard F.]

Re: Carb install on 66, 327, 300HP Thanks for the

Willie,

I think I'd put the SS baffle on anyhow, you never know what else it does. If you have to take to carb off at least the bottom of your carb isn't all gummed up with the gasket.

Jerry